Specifically, if the dealer has more than two uncovered cards in his hand, then the dealer is likely to have more low cards than high cards. This is a big deal for Double Deck games.
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Depends, of course, on the game, spread, etc. But for 4.5/6, 1-12 or 1-16, S17, DAS vs. S17, DAS, LS, the gains are more than 50%. See BJA3, p. 232.
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